If you're a reasonably successful adult, and you've earned it, you are usually a fairly tough SOB.
You've had to outperform folks, learn a skill/trade, put up with bullshit, go without during tough times, etc.
Most of us would look at Paris' stint - 23 days in solitary - and deal with it. Would it suck? Sure. But you'd do the time, spend a little time doing crunches and pushups and reading, then get back out and learn from it. Tough luck.
But Paris isn't tough - she's never had to make a choice about which thing to buy, work two jobs, struggle, work a long shift at a terrible job, etc. Without the conditioning and toughness, she can't fathom surviving in jail. And if you look at most folks in jail - they're built and trained for that. She isn't.